I found this on Oh Gizmo! yesterday. It's a flash based bandwidth tester that works well, looks nice and is much easier to understand because it's packaged in a nice looking interface.
http://www.speedtest.net/
About gene
Gene has worked in web development since 1996. He joined Lanlogic in 1999 and is now our web services director. He has been instrumental in helping us develop our hosted solutions offerings at
www.lanlogic.net. Gene has extensive experience with a variety of technologies to support web development, database management, and audio/video streaming. He has consulted in public, private, educational, and governmental sectors totaling over 100 institutions. Gene has a BS in Statistics from CSUEB, lives in Oakland, and plays saxophone in his spare time.